<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>switch语句</title>
<script type="text/javascript">
var now=new Date();
var day=now.getDay();
var week;
switch(day){
    case 1:week="星期一";break;
    case 2:week="星期二";break;
    case 3:week="星期三";break;
    case 4:week="星期四";break;
    case 5:week="星期五";break;
    case 6:week="星期六";break;
    case 7:week="星期日";break;
}
alert("今天是"+week);
</script>
</head>
<body>

</body>
</html>